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Why COVID vaccines are so difficult to compare
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Why COVID vaccines are so difficult to compare

Heidi Ledford A COVID-19 vaccination centre in Dhaka.Credit: Mohammad Ponir Hossain/Reuters/Alamy Yusuff Adebayo Adebisi knows that a vaccine that offers 70% protection against COVID-19 could be a valuable tool against the coronavirus pandemic in Nigeria — especially if that vaccine is cheap and doesn’t have to be stored at extremely cold temperatures. But what if...